Originally Posted by rpdenney
My daughter has a 2001 Optima V6 with the check engine light on. We have codes:
P0168, P0755, and P0760.
The codes P0755, and P0760 indicate a problem with the Shift Solenoid "C" and Shift Solenoid "B". Where are they located and are they fairly easy to replace?
This trouble code deals with shift solenoid B (P0755) or C (P0760), which sets variable valve position and transfers it to appropriate fluid path. To do this, solenoid valve receives electric signal for TCU to set the proper shift gear proper to the current driving condition and it turns two solenoid valves on and off (combine) depending on the gearshift to set the variable valve position. Corresponding code will be displayed when the input to the E/TCU coincides with criteria. Solenoid Valve for Pressure Control - Sensor type : Normal open 3-way - Operating temperature : -30°C~130°C - Frequency : LR, 2ND, UD, OD, RED : 61.27Hz (at the ATF temp. -20°C above) DCC : 30.64Hz ※ KM series : 35Hz - Internal resistance : 2.6Ω or more - Surge voltage : 56 V
Possibly an internal issue with the transmission valve body, the wiring between it and the TCU or the TCU is the source of the issue. Either way it should go to a reputable repair shop for diagnosis. Any issues with the transmission shifting?